linux-kernel - Re: [PATCH] drm/amd/display: Fix identical code for different branches

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Message-ID: <a8f75357ab3bd3b37269e51a38aafa997307570f.camel@perches.com>
Date:   Sun, 11 Jul 2021 10:45:48 -0700
From:   Joe Perches <joe@...ches.com>
To:     Len Baker <len.baker@....com>,
        Harry Wentland <harry.wentland@....com>,
        Leo Li <sunpeng.li@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        "Pan, Xinhui" <Xinhui.Pan@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     Wenjing Liu <wenjing.liu@....com>,
        Martin Tsai <martin.tsai@....com>,
        Kees Cook <keescook@...omium.org>,
        George Shen <George.Shen@....com>,
        Yu-ting Shen <Yu-ting.Shen@....com>,
        Nicholas Kazlauskas <nicholas.kazlauskas@....com>,
        Bhawanpreet Lakha <Bhawanpreet.Lakha@....com>,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/amd/display: Fix identical code for different
 branches

On Sun, 2021-07-11 at 19:24 +0200, Len Baker wrote:
> The branches of the "if" statement are the same. So remove the
> unnecessary if and goto statements.
> 
> Addresses-Coverity-ID: 1456916 ("Identical code for different branches")
> Fixes: 4c283fdac08ab ("drm/amd/display: Add HDCP module")
> Signed-off-by: Len Baker <len.baker@....com>

I'm not a big fan of this type of change.

It's currently the same style used for six tests in this function
and changing this last one would just make it harder to see the
code blocks as consistent.

I doubt any reasonable compiler would produce different objects.

> diff --git a/drivers/gpu/drm/amd/display/modules/hdcp/hdcp1_execution.c b/drivers/gpu/drm/amd/display/modules/hdcp/hdcp1_execution.c
[]
> @@ -305,10 +305,8 @@ static enum mod_hdcp_status wait_for_ready(struct mod_hdcp *hdcp,
>  				hdcp, "bcaps_read"))
>  			goto out;
>  	}
> -	if (!mod_hdcp_execute_and_set(check_ksv_ready,
> -			&input->ready_check, &status,
> -			hdcp, "ready_check"))
> -		goto out;
> +	mod_hdcp_execute_and_set(check_ksv_ready, &input->ready_check, &status,
> +				 hdcp, "ready_check");
>  out:
>  	return status;
>  }
> --
> 2.25.1
>